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There have been complaints in the last few years about the quality of the materials Aquascapes has been putting into their stuff, including screws/bolts/nuts that easily strip when assembling the biofalls and skimmer (and one stripped nut/set of threads pretty much makes the thing useless. I've heard some bad things about the Aquascapes pumps lately as well. Going with a brand name other than AS would probably be smart. Others here are pretty positive about Savio stuff - I have yet to try there stuff, but on my next mid-sized pond install we'll give them a go.
They say that for ponds of that size you want to turn over the water volume once per hour, so as Dire Wolf said, get a pump that's going to match in GPH (at 5' head) the volume of the pond.
I believe some here have used the inline UV filtration systems with success, and we had a client that added it after we built the pond, and he liked his as well. Something to consider if you aren't going to have lots of plant life and fish, and if you aren't going to have the time to manage water pH and algae (because those things WILL take time).
Maybe this is serendipity - I've been meaning to write an article about building large scale water features. Maybe this'll get the juices flowing.
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